common : reimplement logging (#9418)

https://github.com/ggerganov/llama.cpp/pull/9418

ci/run.sh

@@ -737,6 +737,9 @@ function gg_sum_embd_bge_small {
 
 ## main
 
+export LLAMA_LOG_PREFIX=1
+export LLAMA_LOG_TIMESTAMPS=1
+
 if [ -z ${GG_BUILD_LOW_PERF} ]; then
     # Create symlink: ./llama.cpp/models-mnt -> $MNT/models/models-mnt
     rm -rf ${SRC}/models-mnt